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Old 05-04-2012, 01:58 AM #1
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Default 17mm buck-boost driver (TPS63020 and LT6106)

Open source laser driver. Final version
happy testing



gerber files FINAL VERSION

eagle v6 files FINAL VERSION

TINA-TI simulation file


TINA-TI is a free Texas Instruments Spice-based analog simulation program

Inductor XFL4020-152ME

DigiKey parts:
D1 - 568-6287-1-ND
C2, C3, C4, C5 - 445-8028-1-ND
R3 (Shunt, package 0805) - WSLA-.01CT-ND
R2 (current set trimmer) - 3214W-201ETR-ND

R1 (5 Kohm), R4 (10 ohm) - package 0603, use components with a good temperature coefficient (<100ppm/C)
C6 (100uF) - package 1206
C1 (0.1uF) - package 0603, any good decoupling capacitor
R5 (470 ohm) - package 0603
C7 (10 nF) - package 0603

R5-C7 form the loop frequency compensation network.
C8 is optional (secondary pole for testing purposes).
The values of R5 and C7 can be experimentally adjusted.
With the given trimmer R2 the output current range is 0.1 to 2.1 A

.
Attached Thumbnails
17mm buck-boost driver (TPS63020 and LT6106)-driver.jpg  
Attached Files
File Type: zip eagle_files_final.zip (45.4 KB, 239 views)
File Type: zip gerber_final.zip (13.6 KB, 109 views)
File Type: zip driver_tsc.zip (26.9 KB, 137 views)



Last edited by laserluke; 05-22-2012 at 09:11 PM.
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Old 05-04-2012, 02:03 AM #2
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Cool but do you have any test results??? How well does it work, parts list, it seems you want to make it open source which is great
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Old 05-04-2012, 02:31 AM #3
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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Originally Posted by AnthoT View Post
Cool but do you have any test results??? How well does it work, parts list, it seems you want to make it open source which is great
I want to make it open source. Everyone can try it and, if possible, improve it...
This is the right spirit for this project.
I think that many people of this forum know the capabilities and limits of the TPS63020. I hope this circuit becomes the right way to use it for lasers
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Old 05-04-2012, 02:33 AM #4
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by laserluke View Post
I want to make it open source. Everyone can try it and, if possible, improve it...
This is the right spirit for this project.
I think that many people of this forum know the capabilities and limits of the TPS63020. I hope this circuit becomes the right way to use it for lasers
I'll order a few and let you know how they work that's why I was asking a parts list
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Old 05-04-2012, 03:02 AM #5
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by AnthoT View Post
I'll order a few and let you know how they work that's why I was asking a parts list
Ok... DigiKey parts:
D1 - 568-6287-1-ND
C2, C3, C4, C5, C6 - 445-8028-1-ND
R3 (Shunt, package 0805) - WSLA-.01CT-ND
R2 (current set trimmer) - 3214W-201ETR-ND

R1 (5 Kohm), R4 (10 ohm) - package 0603, use components with a good temperature coefficient (<100ppm/C)
C1 (0.1uF) - package 0603, any good decoupling capacitor
C7 (1 nF) - package 0603, optional to reduce the feedback path noise

L1 - Coilcraft XFL4020-152ME (you can obtain free samples from Coilcraft here)
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Old 05-04-2012, 05:32 AM #6
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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Originally Posted by laserluke View Post

That looks great but shoudn't the V+ of the LT6106 be connected to the input (to the battery) instead of the output of the driver?

and why is the zener used at all? I don't see why it's needed.. please explain.

and I think those 6.3V caps are better to be replaced with 10V caps.

can you test the output with oscilloscope? tps63020 it's known to show ripple currents when using high-side current sense monitoring.

Last edited by foulmist; 05-04-2012 at 05:53 AM.
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Old 05-04-2012, 09:46 AM #7
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by foulmist View Post
That looks great but shoudn't the V+ of the LT6106 be connected to the input (to the battery) instead of the output of the driver?

and why is the zener used at all? I don't see why it's needed.. please explain.

and I think those 6.3V caps are better to be replaced with 10V caps.

can you test the output with oscilloscope? tps63020 it's known to show ripple currents when using high-side current sense monitoring.
1) In the high side current sensing circuit, the V+ is connected to the current source because the +IN of the opamp must not exceed V+.
2) If you leave the driver's output without a load (the laser diode), the driver has a zero voltage feedback and increases the output voltage until output capacitor make a loud boom!!! The zener diode solves this problem: when the sum of output voltage+0.5Volt nominal feedback is more than Vz, in the zener diode starts to flow current, the feedback becomes again effective and the output voltage is limited.
3) You can replace the 6.3V capacitors with 10V if you can find 22uF with 0603 package.
4) Why tps63020 should shows ripple currents when using high side current sensing? It seems a not established generic statement.
5) At last... you can try yourself to test the output with an oscilloscope. It's an open source project
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Old 05-04-2012, 09:48 AM #8
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

I asked because the TPS63020 has already build in OVP that's why I think the zener is not needed. It's actually 6.7-6.9V = the OVP. Already tested

Quote:
Originally Posted by laserluke View Post
1) In the high side current sensing circuit, the V+ is connected to the current source because the +IN of the opamp must not exceed V+.
2) If you leave the driver's output without a load (the laser diode), the driver has a zero voltage feedback and increases the output voltage until output capacitor make a loud boom!!! The zener diode solves this problem: when the sum of output voltage+0.5Volt nominal feedback is more than Vz, in the zener diode starts to flow current, the feedback becomes again effective and the output voltage is limited.
3) You can replace the 6.3V capacitors with 10V if you can find 22uF with 0603 package.
4) Why tps63020 should shows ripple currents when using high side current sensing? It seems a not established generic statement.
5) At last... you can try yourself to test the output with an oscilloscope. It's an open source project

Last edited by foulmist; 05-04-2012 at 09:49 AM.
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Old 05-04-2012, 11:15 AM #9
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Nice!
I'll try it out soon and let you know

Quote:
Originally Posted by laserluke View Post
Ok... DigiKey parts:
D1 - 568-6287-1-ND
C2, C3, C4, C5, C6 - 445-8028-1-ND
R3 (Shunt, package 0805) - WSLA-.01CT-ND
R2 (current set trimmer) - 3214W-201ETR-ND

R1 (5 Kohm), R4 (10 ohm) - package 0603, use components with a good temperature coefficient (<100ppm/C)
C1 (0.1uF) - package 0603, any good decoupling capacitor
C7 (1 nF) - package 0603, optional to reduce the feedback path noise

L1 - Coilcraft XFL4020-152ME (you can obtain free samples from Coilcraft here)
So that's looking at 14.92$ per board (no shipping or PCB) with the TPS63020 and all the components you listed
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Old 05-04-2012, 11:55 AM #10
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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Originally Posted by AnthoT View Post
Nice!
I'll try it out soon and let you know



So that's looking at 14.92$ per board (no shipping or PCB) with the TPS63020 and all the components you listed
my driver is a similar one and components are pretty much the same price per board. you add the pcb, work and stuff and you are looking at ~$20 per board

Last edited by foulmist; 05-07-2012 at 09:33 AM.
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Old 05-04-2012, 12:06 PM #11
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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Originally Posted by foulmist View Post
my driver is a similar one and components are pretty much the same price per board. you add the pcb, work and stuff and you are looking at ~$20 per board without any profit .
I don't think I'm going to sell them actually, I only wanted to make one or two for a future builds I had planned I have a reflow oven so depending how much or how little work I'll see wether i end up deciding to sell them... I don't think I will though
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Old 05-04-2012, 12:12 PM #12
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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Originally Posted by AnthoT View Post
I don't think I'm going to sell them actually, I only wanted to make one or two for a future builds I had planned I have a reflow oven so depending how much or how little work I'll see wether i end up deciding to sell them... I don't think I will though

be sure to test them on scope first with a test load. And sharing the results would be nice

Last edited by foulmist; 05-04-2012 at 12:13 PM.
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Old 05-04-2012, 12:14 PM #13
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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be sure to test them on scope first with a test load. And sharing the results would be nice
I don't have a scope
I can share any other results though I'll be ordering them sometime this week, I'll have time then
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Old 05-04-2012, 01:26 PM #14
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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Great Wall of China
The Great Wall of China is one of the magnificent man-made wonders in the history of mankind, built about 2000 years ago. Though many sections of the Great Wall of China has ruined, it is still one of the structure that has a glorious history and an appealing architecture. The Great Wall stretches across mountains, deserts, grasslands for about 5,500.3 miles (8,851.8 kilometers) from east to west in the northern part of China. The Great Wall of China was built to protect the northern Chinese empire from foreign invasions.
LMAO. Most. Random. Ever.

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Old 05-04-2012, 03:19 PM #15
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

laserluke I wasn't making any mention to your driver, which does deserve a for being open sourced!

You should edit your last message instead of posting twice in a short amount of time if nobody has replied... double posting is often frowned upon.
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Old 05-04-2012, 03:32 PM #16
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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Originally Posted by cilegray View Post
laserluke I wasn't making any mention to your driver, which does deserve a for being open sourced!
Many thanks
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